RFR: 8341184: Clean up the interaction between the launcher native code and the LauncherHelper [v16]

[Jaikiran Pai]

On Mon, 24 Feb 2025 09:46:29 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

>> Can I please get a review of this change, which simplifies the interaction between the `java` launcher's native code with the `sun.launcher.LauncherHelper`? 
>> 
>> As noted in https://bugs.openjdk.org/browse/JDK-8341184, this proposed change reduces the back and forth between the launcher's native code and the `LauncherHelper` class. This also removes the additional reflective lookups from the native code after the main class and main method have been determined by the `LauncherHelper`. 
>> 
>> Although this is a clean up of the code, the changes in the `LauncherHelper` to return a `MainEntry` have been done in a way to facilitate additional upcoming changes in this area, which propose to get rid of the JAR manifest parsing from the launcher's native code.
>> 
>> No new tests have been added. Existing tests in tier1, tier2 and tier3 continue to pass.
>
> Jaikiran Pai has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:
> 
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - merge latest from master branch
>  - ... and 6 more: https://git.openjdk.org/jdk/compare/e410af00...d1ac5174

I will move this to draft for now and will come back to this in the next release.

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PR Comment: https://git.openjdk.org/jdk/pull/21256#issuecomment-2880182423